354 
GAMMARIDiE. 
AMPHIPODA . GAMMA RIDES. 
NATATORIA. 
EURYSTHEUS ERYTHROPHTHALMUS. 
Specific character. Second pair of gnathopoda having the palm lunate 
and armed with three short points. 
Length 3 inch. 
Gammarus erytlirophthalmus. Liljeborg, in Ofvers. af Kongl. Yet. Akad. 
Forhandl. 1855, p. 124. 
Eurystheus erythrophthalmus. Spence Bate, Cat. Amph. Brit. Mus. p. 196, 
pi. XXXV. fig. 7. 
Eurystheus tridentatus. Spence Bate, Rep. Brit. Assoc. 1855, 
p. 58. Ann. Nat. Hist. 2 ser. xix. 
p. 143. White, Pop. Hist. Brit. Crust. 
p. 181. 
In this species the head and body are more than half 
the entire length of the animal. All the segments are 
smooth and clean, except the ante- and penultimate 
segments of the tail, which are laterally furnished with 
a single hair on each side, springing from a notch or 
fissure. The eyes are reniform, of a scarlet colour, and 
situated in the same line with the axis of the superior 
antennae, instead of their normal place between the 
superior and inferior pairs. The superior antennae 
